Zener Enhancement of Quantum Tunneling in a Two-Level Superconducting Circuit
G. Ithier, E. Collin, P. Joyez, D. Vion, D. Esteve, J. Ankerhold, H. Grabert
DOI 10.1103/PhysRevLett.94.057004 · Physical Review Letters
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Abstract
We have investigated the macroscopic quantum tunneling (MQT) of the phase across a Josephson junction embedded in a superconducting circuit. This system is equivalent to a spin 1/2 particle in a potential energy well. The MQT escape rate of such a particle was recently predicted to be strongly modified when a crossing of its inner Zeeman levels occurs while tunneling. In this regime, we observe a significant enhancement of the MQT rate and compare it to theory.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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